PORT Melbourne residents who witnessed heavily-armed police raid a property linked to the Mongols outlaw bikie gang said it was "intense".

Detectives from Taskforce Echo and Special Operations Group officers raided the property in Nott Street at 6am.

No arrests have been made.

The Mongols are the sworn enemy of the Hells Angels, and they've only recently arrived in Melbourne.

The Mongols are in the final stages of a national "patch-over'' of the Finks, including the rebadging of its Victorian chapter. There are fears the move could ignite outlaw bikie tensions to flash point.

A witness told the Herald Sun he watched police pounce on a man who surrendered from the building with his hands up about five minutes after they arrived.

"He was put on the ground and his hands were tied with cable ties, then he was rolled over from side to side to check what was in his pockets, then he was stood up and walked towards Rouse St," he said.

"Then (police) continued to ask for a gentleman by name, then after a period of about 10 minutes, they lined up and entered yelling 'police, police, put your hands up'.”

The man said he did not see anyone else emerge from the property, adding that lots of people often come and go from the business.

"They look like they are bike enthusiasts, that’s the way I would describe them," he said.

"They have been there for about nine months. They haven’t caused us any grief. They do a lot of work on their bikes with the roller door up."

However a woman who watched the raid from her balcony said she was still shaking an hour later.

"It was really intense," she said.

"I've never seen anything like it before."

The woman said she watched heavily-armed police block off the street and a "huge black police van" arrive.

She said police were calling for 'Shane' to come out with his hands up.

"The hardcore police were everywhere with their guns, all out the front here, all out on the streets, behind cars," she said.

"A man came out with his hands up, but I don't think he was the guy they were looking for."

Police then raided the premises, she said.

"They didn't bring anything out," she said.

"Once they realised no-one else was there they pretty much just got back in their cars and left."

Another resident described the scene as like something out of a Hollywood movie.

"It was about 5.45am and I woke up to the sirens and then they said over the megaphone 'come to the front door with your hands up'," he said.

"It's a strange thing to wake up to - I was thinking I've only heard that sort of thing in the movies."

About 30 minutes after police left, a well-built man in fitness clothes emerged from the building and drove off in his silver Mercedes.

The Mongols MC

Last month, Detective Inspector Ian Campbell said the Mongols' arrival in Melbourne could further destabilise an already knife-edge outlaw bikie scene.

"The Mongols are an international club with a hatred of the Hells Angels,'' he said.

"They (the Hells Angels) will be a bit nervous about it.''

"Why do the Finks need the patch of an international gang?

"If they're a motorcycle club, why do they need to patch over? Why do they need the international support?

"It does destabilise the scene,'' he said.

He said the Mongols were likely to see Australia as a lucrative market and, as former Finks, were expected to continue an allegiance with the Comancheros and Bandidos - both enemies of the Angels.

The Mongols origins date back to 1969 when Hispanic bikies, refused entry to the Hells Angels because of their race, decided to form their own club.

The clubs' rivalry turned deadly during a confrontation in Nevada in 2002 that left three bikies - two Angels and one Mongol - dead.

But the Mongols' new Melbourne chapter president, Frank Dieni, said the public had nothing to fear from the club and it has no beef with any other "one per cent'' club.

Specifically, he said the Mongols violent history overseas - predominantly with the Hells Angels - would not pervade the Australian chapters.

"I don't believe they're (the Hells Angels) going to be nervous about it,'' he said last month.

"They've known us as Finks and they've known us as who we are and there is no difference.

"We're not going to continue on any history that another country has which doesn't really concern us.

"I think if they had any problem they'd be on the phone …..like in the past if they had any problems there'd be phone calls.